KR101285177B1 - Automatic document feeder, image reading apparatus and image forming apparatus having the same - Google Patents

Abstract

Disclosed are a document feeder, an image reading apparatus and an image forming apparatus having the same, which are capable of raising and lowering a pick-up device with one driving source and performing an operation of picking up a document. The document feeder includes a pickup device having a pickup roller for picking up a document, and a lifting device for lifting the pickup device. And a pickup driving device having a pickup motor rotating in the first direction and driving the pickup roller, and rotating in the second direction and driving the lifting device.

Description

Document feeder, image reading apparatus and image forming apparatus having same {AUTOMATIC DOCUMENT FEEDER, IMAGE READING APPARATUS AND IMAGE FORMING APPARATUS HAVING THE SAME}

The present invention relates to a document feeder, and more particularly, to a document feeder having an improved drive structure of a pickup device, an image reading apparatus and an image forming apparatus having the same.

An image reading apparatus is an apparatus for reading image information recorded in an original, and is attached to various image forming apparatuses such as a facsimile, a digital copier, a multifunction printer, and the like.

The image reading apparatus may be provided with a document feeder for automatically feeding the originals so that the originals can be read continuously. The document feeder has a pickup device for picking up and transporting documents loaded on the document feeder. The document picked up by the pickup apparatus is supplied to a reading unit such as an image sensor, and the image information is read by the reading unit.

The pick-up apparatus maintains the state of being raised upwards so as not to interfere with the loaded original when the user inserts the original into the document feeder, and when picking up the original, the pickup device descends toward the original loaded in the document feeder. The pick-up apparatus performs a pick-up operation in contact with the original while being lowered toward the original.

One aspect of the present invention discloses a document feeder, an image reading apparatus and an image forming apparatus having the same, which can lift and lower a pickup apparatus with a single driving source and perform an operation of picking up a document.

According to an aspect of the present invention, a document feeder includes: a pickup device having a pickup roller for picking up a document; and a lifting device for lifting the pickup device; and driving the pickup roller while rotating in a first direction and rotating in a second direction. And a pickup driving device having a pickup motor for driving the lifting device.

The pick-up apparatus may further include a rotating shaft and a supporting member supporting the pickup roller and rotatably installed about the rotating shaft, and the lifting apparatus may include a lifting lever for lifting the supporting member.

The document feeder may further include an elastic member for elastically biasing the pickup device in a downward direction of the pickup device.

The pickup driving device may further include a cam that rotates by the pickup motor and drives the lifting lever.

The lifting device further includes a lever pivot, wherein the lifting lever comprises a shaft engaging portion rotatably coupled to the lever pivot, an interference arm extending from the shaft engaging portion to interfere with the cam, and the shaft engaging portion. And an actuating arm having a support portion extending from the portion and supporting the support member.

The document feeder may further include a sensing device for controlling the position of the cam.

The sensing device may include a sensing member that rotates together with the cam, and an optical sensor that senses the sensing member.

The pickup driving device may further include a first one-way clutch gear for selectively transmitting power of the pickup motor to the lifting device.

The pickup driving device may further include a second one-way clutch gear for selectively transmitting power of the pickup motor to the pickup roller.

In addition, the document feeder according to the spirit of the present invention is a pickup roller for picking up a document; and a support member for supporting the pickup roller; and a rotating shaft for rotatably supporting the support member; and the pickup member by rotating the support member Lifting lever for lifting; and the pickup motor for driving the pickup roller and the lifting lever; and a first power transmission path for transmitting the power of the pickup motor to the pickup roller; and branched from the first power transmission path, And a second power transmission path for transmitting power of the pickup motor to the lifting lever.

The pickup motor may rotate in the first direction to drive the pickup roller, and rotate in the second direction to drive the lifting lever.

The document feeder may further include a cam disposed on the second power transmission path to rotate the lifting lever.

The document feeder may further include a first one-way clutch that is disposed between the first power transmission path and the second power transmission path to control power transmitted to the second power transmission path.

The document feeder may further include a second one-way clutched gear disposed on the first power transmission path to control the power transmitted to the pickup roller.

In addition, the image reading apparatus according to the spirit of the present invention is a reading apparatus main body having a document feeder and a document feed path; and a reading unit for reading image information from the document on the document feed path; and the document placed on the document feeder. A pickup device having a pickup roller for picking up and transporting the document transfer path; and a lifting device for lifting the pickup device; and a pickup motor capable of driving in both directions and driving the pickup roller and the lifting device; and the pickup And a first power transfer unit for transmitting the power of the motor to the pickup roller, and a second power transfer unit for transferring the power of the pickup motor to the lifting device.

The pick-up apparatus further includes a support member for supporting the pickup roller, one side of the support member is rotatably supported on a rotating shaft, and the lifting device lifts the pickup roller by rotating the other side of the support member. It may include a lifting lever.

The lifting lever may include a support pole protruding downward of the support member to support the support member.

The first power transmission unit may include a drive shaft rotated by the pickup motor, and a first one-way clutch gear installed on the drive shaft to control power transmitted to the second power transmission unit.

The first power transmission unit may include a second one-way clutch gear installed on the rotating shaft to control the power transmitted to the pickup roller.

The second power transmission unit may include a cam that rotates by the power transmitted through the first one-way clutch gear and drives the lifting lever.

The image reading apparatus may further include a guide arm having a support arm rotatably installed on the drive shaft, a guide arm coupled to the lifting lever to guide the lifting lever and the other side rotatably coupled to the support arm. have.

In addition, the image forming apparatus according to the spirit of the present invention includes an image reading apparatus having a reading unit for reading an image from an original, and a document feeding device for picking up and transferring the original to the reading unit; and a printing apparatus for printing an image on paper; The document feeder includes: a pickup device having a rotating shaft, a supporting member disposed to rotate about the rotating shaft, and a pickup roller supported by the supporting member; and a lifting lever for lifting and lowering the supporting member. And a pickup motor which rotates in the direction and drives the pickup roller, and which rotates in the second direction and drives the lifting lever.

The document feeder may further include an elastic member for elastically biasing the support member in a downward direction of the support member.

The document feeder may further include a cam that rotates by the power transmitted from the pickup motor and rotates the lifting lever by interfering with one side of the lifting lever.

According to the exemplary embodiment of the present invention, the number of driving sources for driving the pickup apparatus can be reduced, thereby reducing component costs and simplifying the driving structure of the pickup apparatus.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a diagram illustrating a configuration of an image forming apparatus according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating a configuration of an image reading apparatus according to an embodiment of the present invention.

As shown in Fig. 1, the image forming apparatus 1 includes an image reading apparatus 2 for reading an image recorded on an original, and a printing apparatus 3 for printing an image on paper.

The printing apparatus 3 prints an image according to a signal input from the image reading apparatus 2 or a signal input from an external device such as a PC, and the like. 30), a transfer device 40, a fixing device 50 and a discharge device 60.

The optical scanning device 20 irradiates the photoconductors 31K, 31C, 31M and 31Y with light corresponding to the image information to form an electrostatic latent image on the surfaces of the photoconductors 31K, 31C, 31M and 31Y.

The developing apparatus 30 supplies a developer to the electrostatic latent images formed on the photosensitive members 31K, 31C, 31M, and 31Y to form a visible image. The developing device 30 includes four developing devices 30K, 30C, each containing a developer of different colors, for example, a developer of black (K), cyan (C), magenta (M), and yellow (Y) colors. 30M, 30Y).

The transfer device 40 includes an intermediate transfer belt 41, first transfer rollers 42, and a second transfer roller 43. The visible images formed on the photosensitive members 31K, 31C, 31M, and 31Y are transferred to the intermediate transfer belt 41 by the first transfer rollers 42, and the image of the intermediate transfer belt 41 is fed to the paper feed unit 10. It is supplied from the sheet and transferred to the sheet passing between the second transfer roller 43 and the intermediate transfer belt 41.

The sheet having passed through the transfer device 40 enters the fixing device 50. The fixing device 50 includes a heating roller 51 and a pressure roller 52. The paper on which the image has been transferred passes between the heating roller 51 and the pressure roller 52, and at this time, the image is fixed to the paper by heat and pressure.

The sheet having passed through the fixing device 50 is guided to the discharge device 60 and discharged to the outside of the printing device 3 by the discharge roller 61.

As shown in FIGS. 1 and 2, the image reading apparatus 2 has a reading apparatus body 100 including a reading frame 110 and a cover 120. The cover 120 is rotatably coupled to the leading frame 110 to open and close the top surface of the leading frame 110.

A reading unit 130 is installed inside the reading frame 110 to read information recorded in the document, and a cover 120 is provided with a document feeder 200 for automatically feeding the document to enable continuous scanning. do.

The first glass 140 and the second glass 150 are provided on the upper surface of the reading frame 110. The first glass 140 is for the user to place the originals one by one for reading, and the second glass 150 is for reading the originals transferred by the document feeder 200. The reading unit 130 is disposed under the first glass 140 and the second glass 150, and is recorded in the document placed on the first glass 140 or the document transferred by the document feeder 200. Read image information.

The reading unit 130 detects light reflected from the original by irradiating light onto the original, and converts the amount of light into an electrical signal to read information from the original. The read unit 130 may be a CIS (Contact Image Sensor) or a CCD (Charge Coupled Device).

The document feeder 200 includes a document feeder 210 into which a document to be read is inputted, a pickup device 220 to pick up and transport the document fed into the document feeder 210, and a cover 120 to transport the document. The document transfer path 230 formed therein, the first document discharge port 240 through which the finished document is finally discharged, and the second document from which a part of the document finished reading on the first side is discharged during double-sided reading. It is configured to include an outlet (250).

The document feeder 210 is provided with a document feeder 211 for loading the document (D) to be transported by the document feeder 200, and the document discharged after finishing the reading process near the first document discharge port 240 The document holder 241 to be stacked is provided. A document support 251 may be installed between the document feeder 211 and the document feeder 241 to guide the document discharged through the second document discharge port 250. The document support 251 supports the document when the document is discharged to the outside of the cover 120 before the document is reversed in the first reverse path 235 to be described later to prevent the document from sagging down.

The document feed path 230 is a reading path 231 in which a reading operation is performed by the reading unit 130, and one end is connected to the document input port 210 and the other end is connected to one side of the reading path 231. 232, and one end is connected to the other side of the reading path 231, the other end is configured to include a discharge path 233 is connected to the first document discharge port 240.

A pickup roller 221, a feed roller 261, and a register roller 262 are disposed in the paper feed path 232. The pickup roller 221 picks up the original loaded on the document feeder 211, and the feed roller 261 transfers the original picked up by the pickup roller 221. The register roller 262 transfers the original after aligning the leading edge of the original.

The second glass 150 is disposed on the reading path 231 so that the reading unit 130 can read the image information recorded on the document passing through the reading path 231 and the upper part of the second glass 150. A white bar 270 is pressed to press the document so that the glass is in close contact with the second glass 150. In addition, a first reading roller 263 is disposed on the upstream side of the second glass 150 in the reading path 231 to transfer the document entering the reading path 231 to the reading unit 130, and the second glass 150 is disposed therein. On the downstream side of the) is a second read roller 264 for transferring the document passing through the read unit 130 is disposed.

In addition, the document transfer path 230 is a two-sided document environment path 234 connecting the downstream side and the upstream side of the reading path 231, one end is in communication with the two-sided document environment path 234, the other end of the second document discharge port The first reverse path 235 communicated with the 250, one side of the two-sided document transfer path 238 is connected to the reading path 231, the two-sided document transfer path 238 and the discharge path 233 is connected A second inversion path 236 and a guide path 237 extending from the double-sided document transfer path 238.

The first inversion roller 265 is disposed upstream of the discharge path 233 and the first reverse path 235, and the discharge roller 266 is disposed on the discharge path 233. A second inversion roller 267 is disposed on the double-sided document feed path 238.

On the other hand, the first path switching unit 281 is disposed downstream of the second read roller 264, and the second path switching unit 282 is disposed downstream of the first inversion roller 265. The first path switching unit 281 guides the document passing through the read path 231 toward the first inversion roller 265 to the first position (indicated by a solid line in FIG. 2) and to the double-sided document transfer path 238. Rotate between the second position (indicated by the virtual line in FIG. 2). The second path switching unit 282 guides the document passing through the first inversion roller 265 to the discharge path 233 to the first position (indicated by a solid line in FIG. 2) and to the first inversion path 235. Rotate between the second position (indicated by the virtual line in FIG. 2).

When the document is read in the cross section of the original, the image is read in the reading path 231 is guided toward the first inversion roller 265 by the first path switching unit 281, and discharged by the second path switching unit 282. Guided to the path 233 is discharged to the document medium 241 by the discharge roller 266.

When the document is read on both sides of the document, the document read from the reading path 231 on the first side is guided by the first path switching unit 281 toward the first inversion roller 265, and then to the second path switching unit 282. It is guided to the first reverse path 235 by. The first inversion roller 265 transfers the originals on the first inversion path 235 to the second original discharge outlet 250 and then reverses them at a specific time to transfer the originals to the double-sided original circulating path 234. The document conveyed by the circulation roller 268 in the double-sided original document path 234 enters the read path 231 again, and the second surface of the document is read by the read unit 130. The originals read on both sides are guided to the two-sided document transfer path 238 by the first path switching unit 281. The second inversion roller 267 transfers the original on the double-sided original transfer path 238 toward the guide path 237 and then reverses it at a specific time to transfer the original to the second reverse path 236. The document passing through the second inversion path 236 is guided to the discharge path 233 and is discharged to the document tray 241 by the discharge roller 266.

In the embodiment of the present invention, the rotation operation of the pickup roller 221 and the lifting operation of the pickup device 220 are driven by one driving source. Accordingly, the structure for driving the pickup device 220 is simplified by reducing the number of parts to reduce the parts cost.

3 is a perspective view illustrating a pickup device, a lifting device and a pickup driving device in a document feeder according to an embodiment of the present invention, and FIGS. 4 to 6 are perspective views showing some components of FIG. 3. 5 shows a state in which the lifting device lifts the pick-up device, and FIG. 6 shows a state in which the pick-up device is rotated downward.

As shown in Figures 2 and 3, the document feeder 200 is a lifting device 300 for lifting the pickup device 220, pickup pickup device for driving the pickup roller 221 and the lifting device 300. 400.

Pick-up device 220 is disposed on the document feeder 210, and comprises a pickup roller 221, pickup roller shaft 222 and the support member 223. The pickup roller 221 is installed on the pickup roller shaft 222, and the pickup roller shaft 222 is rotatably supported by the support member 223.

One side of the support member 223 is rotatably supported by the rotation shaft 224. When the support member 223 rotates about the rotation shaft 224, the pickup roller 221 supported on the other side of the support member 223 moves up and down.

The support member 223 is disposed on the lower surface of the upper frame 121 of the cover 120, the elastic member 225 is installed between the support member 223 and the upper frame 121. The elastic member 225 elastically biases the support member 223 to maintain the support member 223 rotated downward. Therefore, the pick-up roller 221 is in a state rotated downward in the state that the external force is not applied to the support member 223.

The lifting device 300 may include a lifting lever 310 for supporting the support member 223. When the lifting lever 310 rotates upward by the power transmitted from the pickup driving device 400, the supporting member 223 is raised, and thus the pickup roller 221 is maintained to be rotated upward.

3 and 4, the pickup driving device 400 is a pickup motor 410 capable of driving in both directions, and the first power transfer to transfer the power of the pickup motor 410 to the pickup roller 221. The unit 420, and the second power transmission unit 440 for transmitting the power of the pickup motor 410 to the lifting lever 310 is configured.

The first power transfer unit 420 includes a first gear 421, a second gear 422, a drive shaft 423, a first one-way clutch gear 424, a third gear 425, and a fourth gear 426. ), A fifth gear 427, a second one-way clutch gear 428 and a pickup roller gear 429 form a power transmission path from the pickup motor 410 to the pickup roller 221.

The first gear 421 is installed on the pickup motor shaft 411 and is connected to the second gear 422 through the driving belt 430. The second gear 422, the first one-way clutch gear 424 and the third gear 425 are disposed on the drive shaft 423. When the second gear 422 rotates, the drive shaft 423 rotates, and accordingly, the third gear 425 also rotates. The first one-way clutch gear 424 selectively transmits power transmitted from the pickup motor 410 to the lifting device 300. Specifically, when the pickup motor 410 rotates in the first direction (A direction), the first one-way clutch gear 424 does not rotate together with the drive shaft 423. On the other hand, when the pickup motor 410 rotates in the second direction (B direction), the first one-way clutch gear 424 rotates together with the drive shaft 423 to transmit power to the second power transmission unit 440. do.

The support arm 450 is installed on the drive shaft 423. The support arm 450 does not rotate together with the drive shaft 423, but is simply rotatably installed on the drive shaft 423. The fourth gear 426 is rotatably installed on one side of the support arm 450 and meshes with the third gear 425.

The fifth gear 427 is provided on one side of the rotation shaft 224 and meshes with the fourth gear 426. On the other side of the rotating shaft 224, a second one-way clutch gear 428 is installed, and the second one-way clutch gear 428 is a pickup roller gear installed on the pickup roller shaft 222 through the power transmission belt 431. 429).

The second one-way clutch gear 428 regulates the power transmitted to the pickup roller 221 according to the rotation direction of the rotation shaft 224. Specifically, when the rotation shaft 224 rotates in the first direction (C direction), the second one-way clutch gear 428 rotates together with the rotation shaft 224 to transmit power to the pickup roller gear 429. On the other hand, when the rotation shaft 224 rotates in the second direction (D direction), the second one-way clutch gear 428 does not rotate together with the rotation shaft 224.

Meanwhile, as shown in FIG. 3, the feed roller 261 may be installed on the rotation shaft 224.

As shown in FIGS. 3 to 6, the second power transmission unit 440 includes a sixth gear 441, a seventh gear 442, and a cam 443 at the pickup motor 410. A power transmission path up to 310 is formed.

The sixth gear 441 is engaged with the first one-way clutch gear 424, and the seventh gear 442 is engaged with the sixth gear 441. The seventh gear 442 and the cam 443 are disposed on the camshaft 444. When power is transmitted through the first one-way clutch gear 424, the sixth gear 441 transmits power to the seventh gear 442, and the seventh gear 442 rotates about the cam shaft 444. do. The cam 443 is connected to the seventh gear 442 and rotates with the seventh gear 442.

The lifting device 300 has a lever pivot shaft 320 rotatably supporting the lifting lever 310. The lifting lever 310 has a shaft coupling portion 311 coupled to the lever pivot shaft 320, an interference arm 312 extending from the shaft coupling portion 311 and interfering with the cam 443, and the shaft coupling portion. And an operating arm 313 having a support pole 314 extending from 311 and supporting the support member 223.

As shown in FIG. 5, when the cam 443 is in a position that interferes with the interference arm 312 of the lifting lever 310, the lifting lever 310 rotates about the lever pivot shaft 320, and the operating arm 313. It rises. Therefore, the pickup roller 221 installed in the support member 223 is maintained in a rotated up state. On the other hand, as shown in FIG. 6, when the cam 443 is placed at a position spaced apart from the interference arm 312, the pickup roller 221 installed on the support member 223 is rotated downward by the elastic force of the elastic member 225. Maintain state.

A guide arm 460 for guiding the lifting lever 310 is disposed between the lifting lever 310 and the support arm 450. One side of the guide arm 460 is rotatably coupled to the support arm 450. On the other side of the guide arm 460 is formed a long hole 461, the support pole 314 of the operating arm 313 passes through the long hole 461 of the guide arm 460 to the lower portion of the support member 223 Is extended.

The document feeder 200 also has a sensing device 290 for position control of the cam 443. The sensing device 290 is rotatably installed on the camshaft 444 and includes a sensing member 291 rotating together with the seventh gear 442, and an optical sensor 292 for sensing the sensing member 291. Can be configured.

When the cam 443 is in a position that interferes with the interference arm 312, the sensing member 291 is placed in a position sensed by the optical sensor 292 (see FIG. 5), and the cam 443 is the interference arm. When in a position spaced apart from 312, the sensing member 291 is placed in a position that is not detected by the photosensor 292 (see FIG. 6).

2 to 5, in the standby mode of the image reading apparatus 2, the cam 443 is placed in a position that interferes with the interference arm 312 of the lifting lever 310, and thus the pick-up apparatus ( 220 is rotated upward as indicated by the solid line in FIG. At this time, the sensing member 291 is located in the sensing area 293 of the optical sensor 292 and sensed by the optical sensor 292. In this state, when the document is inputted into the document feeder 210, the document is detected by the document sensor 212 (see FIG. 2) installed in the document feeder 210, and thus the controller (not shown) of the image reading apparatus is picked up. The motor 410 is rotated in the second direction (B direction).

When the pickup motor 410 rotates in the second direction, the rotational force of the pickup motor 410 is transmitted to the second gear 422 through the first gear 421 and the driving belt 430, and the driving shaft 423 Rotate. When the pickup motor 410 rotates in the second direction, the first one-way clutch gear 424 rotates together with the drive shaft 423. When the first one-way clutch gear 424 rotates, the sixth gear 441, the seventh gear 442, the cam 443, and the sensing member 291 rotate. When the cam 443 rotates, the cam 443 which has been in an interference state with the interference arm 312 is spaced apart from the interference arm 312 of the lifting lever 310 as shown in FIG. 6. Then, the support member 223 supported by the support pole 314 of the operating arm 313 is rotated downward by the elastic force of the elastic member 225, the pickup roller 221 is introduced into the document feeder 210 Touch the document. As described above, in the state in which the pickup roller 221 is lowered, the sensing member 291 is not detected by the optical sensor 292 out of the sensing area 293 of the optical sensor 292. Then, the control unit (not shown) of the image reading apparatus stops the rotation of the pickup motor 410 to maintain the pickup roller 221 rotated downward.

On the other hand, when the pickup motor 410 rotates in the second direction, the rotational force of the pickup motor 410 is driven through the drive shaft 423, the third gear 425, the fourth gear 426, and the fifth gear 427. Although transmitted to the rotating shaft 224, at this time, the second one-way clutch gear 428 does not rotate together with the rotating shaft 224 so that power is not transmitted to the pickup roller 221.

The pickup operation of the document is performed while the pickup roller 221 is rotated downward. When the pickup roller 221 is rotated to pick up the original, the pickup motor 410 rotates in the first direction (A direction). The rotational force of the pickup motor 410 is transmitted to the second gear 422 through the first gear 421 and the driving belt 430, and the driving shaft 423 rotates accordingly. When the drive shaft 423 rotates, it meshes with the third gear 425, the fourth gear 426 and the fourth gear 426 meshed with the third gear 425 and the third gear 425 provided at the end of the drive shaft 423. The fifth gear 427 rotates. When the pickup motor 410 rotates in the first direction, the first one-way clutch gear 424 does not rotate together with the drive shaft 423. Therefore, the power of the pickup motor 410 is not transmitted to the lifting lever 310.

When the fifth gear 427 rotates, the rotation shaft 224 rotates. At this time, the rotational force of the rotating shaft 224 is transmitted to the pickup roller gear 429 through the second one-way clutch gear 428 and the power transmission belt 431. Therefore, the pickup roller 221 rotates and picks up the document fed into the document feeder 210. In addition, as the rotating shaft 224 rotates, the feed roller 261 installed on the rotating shaft 224 also rotates and conveys the originals picked up by the pickup roller 221.

When the pickup device 220 is raised, the pickup motor 410 rotates in the second direction in the state shown in FIG. 6. Then, the power of the pickup motor 410 is transmitted to the cam 443 and the cam 443 rotates. When the cam 443 rotates to interfere with the interference arm 312, the lifting lever 310 rotates and the operation arm 313 of the lifting lever 310 rises upward to lift the support member 223.

1 is a diagram illustrating a configuration of an image forming apparatus according to an embodiment of the present invention.

2 is a diagram illustrating a configuration of an image reading apparatus according to an embodiment of the present invention.

3 is a perspective view showing a pickup device, a lifting device and a pickup driving device in the document feeder according to an embodiment of the present invention.

4 to 6 is a perspective view showing a part of the configuration in the document feeder according to an embodiment of the present invention.

Description of the Related Art [0002]

2: image reading apparatus 200: document feeder

220: pickup device 221: pickup roller

223: support member 224: rotation axis

225: elastic member 290: sensing device

300: lifting device 310: lifting lever

400: pickup driving device 410: pickup motor

420: first power transmission unit 424: first one-way clutch

428: second one-way clutch gear 440: second power transmission unit

443: cam

Claims (25)

Pick-up device having a pickup roller for picking up the document; And A lifting device for elevating the pickup device; and A pickup driving device having a pickup motor rotating in a first direction and driving the pickup roller, rotating in a second direction, and driving the lifting device; Document feeder comprising a. The method of claim 1, The pick-up apparatus further includes a rotating shaft and a support member supporting the pickup roller and rotatably installed with respect to the rotating shaft. And said lifting device comprises a lifting lever for lifting said support member. The method of claim 1, And a resilient member for elastically biasing the pick-up device in a downward direction of the pick-up device. 3. The method of claim 2, And the pickup driving device further comprises a cam rotating by the pickup motor and driving the lifting lever. 5. The method of claim 4, The lifting device further comprises a lever pivot, The lifting lever includes a shaft coupling portion rotatably coupled to the lever pivot, an interference arm extending from the shaft coupling portion to interfere with the cam, and a support pole extending from the shaft coupling portion and supporting the support member. A document feeder comprising an operation arm having a. 5. The method of claim 4, And a sensing device for controlling the position of the cam. The method of claim 6, The sensing device includes a sensing member that rotates together with the cam, and an optical sensor for sensing the sensing member. The method of claim 1, And the pick-up driving device further comprises a first one-way clutch gear for selectively transmitting power of the pick-up motor to the lifting device. The method of claim 1, And the pick-up driving device further comprises a second one-way clutch gear for selectively transmitting power of the pick-up motor to the pick-up roller. 3. The method of claim 2, The pickup driving device further comprises a drive shaft rotated by the pickup motor, a support arm disposed on the drive shaft, and a guide arm disposed between the support arm and the lifting lever to guide the lifting lever. Document feeder. Pick-up roller to pick up the document; and A support member for supporting the pickup roller; And A rotating shaft rotatably supporting the support member; and Lifting lever for lifting the pickup roller by rotating the support member; And A pickup motor for driving the pickup roller and the lifting lever; and A first power transmission path for transmitting power of the pickup motor to the pickup roller; A second power transmission path branched from the first power transmission path and transferring power of the pickup motor to the lifting lever; Document feeder comprising a. 12. The method of claim 11, And the pickup motor rotates in the first direction to drive the pickup roller, and rotates in the second direction to drive the lifting lever. 12. The method of claim 11, And a cam disposed on the second power transmission path to rotate the lifting lever. 12. The method of claim 11, And a first one-way clutch gear disposed between the first power transmission path and the second power transmission path to control the power transmitted to the second power transmission path. 12. The method of claim 11, And a second one-way clutched gear disposed on the first power transmission path to control the power transmitted to the pickup roller. Reading device body having a document feeder and a document feed path; and A reading unit for reading image information from an original on the original transfer path; and Pick-up device having a pickup roller for picking up the document placed on the document feeder and conveyed to the document feed path; And A lifting device for lifting the pickup device; and A pickup motor capable of driving in both directions and driving the pickup roller and the lifting device; and A first power transfer unit for transferring the power of the pickup motor to the pickup roller; A second power transfer unit for transferring the power of the pickup motor to the lifting device; Image reading apparatus comprising a. 17. The method of claim 16, The pickup device further includes a support member for supporting the pickup roller, One side of the support member is rotatably supported on a rotating shaft, And the lifting device includes a lifting lever configured to lift the pickup roller by rotating the other side of the support member. 18. The method of claim 17, The lifting lever is an image reading apparatus characterized in that it comprises a support pole protruding below the support member to support the support member. 18. The method of claim 17, The first power transmission unit includes a drive shaft rotated by the pickup motor and a first one-way clutch gear installed on the drive shaft to control the power transmitted to the second power transmission unit. Device. 18. The method of claim 17, And the first power transmission unit includes a second one-way clutch gear installed on the rotating shaft to control the power transmitted to the pickup roller. 20. The method of claim 19, And the second power transmission unit includes a cam that rotates by power transmitted through the first one-way clutch gear and drives the lifting lever. 20. The method of claim 19, And a support arm rotatably mounted to the drive shaft, and a guide arm coupled to the lifting lever, the guide arm having one side to guide the lifting lever and the other side rotatably coupled to the support arm. Device. An image reading apparatus having a reading unit for reading an image from the original, and a document feeding device for picking up the original and transferring the image to the reading unit; and And a printing apparatus for printing an image on paper, wherein the document feeder A pickup device having a rotation shaft, a support member disposed to rotate about the rotation shaft, and a pickup roller supported by the support member; and Lifting lever for lifting the support member; And A pickup motor rotating in the first direction to drive the pickup roller and rotating in the second direction to drive the lifting lever. Image forming apparatus comprising a. 24. The method of claim 23, And the document feeder further comprises an elastic member for elastically biasing the support member in a downward direction of the support member. 24. The method of claim 23, And the document feeder further comprises a cam for rotating by the power transmitted from the pickup motor and for interfering with one side of the lifting lever to rotate the lifting lever.

Images